Аннотация:The textbook written by the professors of the Biological Chemistry Department of the I.M. Sechenov FirstMoscow State Medical University (Sechenov University) approaches сomplicated modern scientific data abouta molecular basis of the functioning of the organism in an intelligible form. This edition contains illustrativematerial, test tasks and situational problems in each of 14 sections. All the problems proposed for the individualsolution have «guiding» questions that help students to solve them. Most of these tasks are based on thequestions covered in the special course «Biochemistry of connective tissue. Biochemistry of mixed saliva».The textbook is intended for medical students who specialize in Dentistry, and can be also used for studyingbiochemistry by the students of other specialties.